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x in (-oo:+oo)
x/8.3 = 3.9/3.5 // - 3.9/3.5
x/8.3-(3.9/3.5) = 0
x/8.3-1.11428571 = 0
0.12048193*x-1.11428571 = 0 // + 1.11428571
0.12048193*x = 1.11428571 // : 0.12048193
x = 1.11428571/0.12048193
x = 9.24857122
x = 9.24857122
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